In , Janell Carroll and colleagues found that most college-aged males had casual sex for physical reasons without emotional attachments. Women, although they very well may also derive pleasure from the act, are generally more interested in the relationship enhancement that sex offers. Research by scientists at the University of California, San Diego, found men who exercised had a boosted libido. Immediately after sexual release, men are physically satisfied. The hormone is also needed to trigger muscle growth and sperm production. Even if you're having a lot of sex, how much time is actually spent doing it compared to other activities in a shared life? Yet, some sexologists say, at the most basic level, there is only one true reason people seek sex. The partners who were given oxytocin were more reasonable and less aggressive with each other. To boost self-esteem, keep a partner from seeking sex elsewhere, or feeling a sense of duty or pressure for example, a partner insists on having sex Continued The Difference Between the Sexes Generally speaking, men seek sex because they like how it feels. Boosting mood and relieving depression Duty. I just wish not every conversation has to somehow relate to sex. Motivations generally fall into four main categories, according to psychologists at UT-Austin who asked more than 1, undergraduate college students about their sexual attitudes and experiences: The best way for a woman to understand this dynamic is to relate it to another physiological need. As both sexes get ready for the day, levels of the stress hormone cortisol rise to help them wake up — and help dampen the effect of sex hormones. But the more attractive a woman feels, the more likely it is that she will want to jump into bed with him.